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Old 17th March 2009, 12:24 PM   #1
xcicc is offline xcicc  Italy
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Default ampli mosfet irf 540 + irf9540

I found this project on the internet I tried to build it but does not work, on the mosfet gate drain and source, there 'always 22v
the power supply is a toroidal 15 + 15v
any suggestion?
thanks
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Old 17th March 2009, 12:47 PM   #2
acid_k2 is offline acid_k2  Italy
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-wich mosfet?

-first step, as always: check power supply, wiring and shorted pins.
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Old 17th March 2009, 12:52 PM   #3
Corax is offline Corax  Germany
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The schematic doesn't seem to be wrong.
And concerning the voltages you mentioned on Gate, Drain and Source of 22V, I guess you mean T5 (IRF540).
For any further 'guesses' it would be nice to see your PCB layout (if there's one at all).
If nothing is blown yet, nothing is getting real hot and no fuse is blown, I still believe the fault is either a missing connection or even a wrong connected transistor. What's by the way the voltage drop between Collector and Emitter of T3 (BC238: the BIAS setting transistor) and what's the voltage level at the sources of the MOSFETs? What is the idle current consumption of the amplifier? What happens if you turn P1 with it's slider slowly in direction to R12, which will/should increase the idle current through the MOSFETs (ATTENTION: stop turning P1 when you reach or exceed a current of 100mA and turn it back if necessary). Since no small Source resistors (i.e. 0.33 ohm) are available you can measure the current of the whole amplifier in the positive rail.
Post your readings and picture(s) and we'll see.
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Old 17th March 2009, 01:05 PM   #4
mjf is offline mjf  Austria
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hello.
perhaps d1 or t5 built in wrong or damaged...........
greetings..............
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Old 17th March 2009, 01:08 PM   #5
xcicc is offline xcicc  Italy
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Quote:
Originally posted by acid_k2
-wich mosfet?

-first step, as always: check power supply, wiring and shorted pins.
Hi, the mosfet are IRF540 and IRF9540
I checked many time the power supply... and above all its very easy and simple....
thanks
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Old 17th March 2009, 01:15 PM   #6
xcicc is offline xcicc  Italy
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Quote:
Originally posted by Corax
[B]The schematic doesn't seem to be wrong.
also for me doesn't seem wrong.

Quote:
And concerning the voltages you mentioned on Gate, Drain and Source of 22V, I guess you mean T5 (IRF540).
I meen 22v on gate drain and source on IRF540 and IRF9540

For any further 'guesses' it would be nice to see your PCB layout (if there's one at all).

yes now post only from my pc after the real photo (give a few minute...)
Quote:
If nothing is blown yet, nothing is getting real hot and no fuse is blown, I still believe the fault is either a missing connection or even a wrong connected transistor. What's by the way the voltage drop between Collector and Emitter of T3 (BC238: the BIAS setting transistor) and what's the voltage level at the sources of the MOSFETs? What is the idle current consumption of the amplifier?


the primary of the transformer I connected a 65W light bulb from 220v to protect. there is a problem if the bulb comes on.

by adjusting the trimmer does not change anything

in almost every measure of the circuit from 21 to + / - 22v
is incredible .... would not believe ...
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Old 17th March 2009, 01:18 PM   #7
xcicc is offline xcicc  Italy
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Quote:
Originally posted by mjf
hello.
perhaps d1 or t5 built in wrong or damaged...........
greetings..............

I have already checked and changed the final more than once ...
beginning to be tired of this simple but that does not work ... seems to take the game to me
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Old 17th March 2009, 01:32 PM   #8
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Old 17th March 2009, 01:35 PM   #9
BV is offline BV  Slovakia
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Change R5 to 820R or 1k( or change R3 to 8.2k or 10k). This schematic needs (to work correct) supply voltage about +-35V.
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Old 17th March 2009, 01:38 PM   #10
xcicc is offline xcicc  Italy
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some picture...
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